It's worth noting that they can literally kill you if you eat more than one of them, although you'd probably have to not eat them quite at the same time. The magnetic force between them is strong enough they could pinch two sections of your intestines together and they'd be unremovable without surgery.

That said, I gave my nephew a set when he was 11 or 12. Told him and his parents what the deal was, they said it was OK. My brother's really into guns, so as long as you know and follow safety rules, he's OK with having things around that can kill you.

"The first death occurred June 22, when 7-year-old Isaac Weiller of Grand Junction, CO, died after deliberately firing one of the spring-loaded plastic missiles into his left nostril. The missile shot into his sinuses, shattering the roof of his nasal cavity and causing a massive brain hemorrhage.

Shortly before dying, Weiller told emergency medical personnel at St. Luke's Medical Center that he had shot the missile into his nose in the belief that it would travel through his body and out his belly button."